 
            ;; collection data type aliases for NEAR_REAL_TIME
            "NEAR_REAL_TIME" [coll22]
+           "NRT" [coll22]
            "near_real_time" [coll22]
            "nrt" [coll22]
            "near-real-time" [coll22]
+           "near real-time" [coll22]
+           "near-real time" [coll22]
 
            ;; summary
            "summary" [coll15]

           "A*C" [coll2 coll5 coll21]
           "XY*" [coll2 coll13]
           "*aser" [coll5 coll7 coll9 coll14]
           "p*ce" [coll6]))
    (testing "search by keywords using wildcard ?."
      (are [keyword-str items]
           (let [refs (search/find-refs :collection {:keyword keyword-str})

           "A?C" [coll2 coll5 coll21]
           "XY?" [coll2 coll13]
           "?aser" [coll5 coll7 coll9 coll14]
           "p*ace" [coll6]
           "NEAR?REAL?TIME" [coll22]
           "near?real?time" [coll22]))
    (testing "sorted search by keywords."
      (are [keyword-str items]
           (let [refs (search/find-refs :collection {:keyword keyword-str})
